Abstract

The spectrum of Theta-1 Ori C (Orion Trapezium) has been observed to
change progressively from type O6 to O4 during 7 consecutive nights.
This observation supports the reality of an even greater range of
variation shown by scattered spectrograms obtained over a longer time
span. Concurrently, variations are seen in the profile of He II 4686 A,
both similar and in addition to the kinds described by Conti. Some
possible implications of these variations with regard to effects on the
surrounding nebulosity, and to a connection with the Trapezium X-ray
source, are briefly pointed out, and several further observations are
suggested.

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